EUGENE, OR - JULY 01: Allyson Felix runs in the first round of the Women's 400 Meters during the 2016 U.S. Olympic Track & Field Team Trials at Hayward Field on July 1, 2016 in Eugene, Oregon. (Photo by Andy Lyons/Getty Images)

EUGENE, OR - JULY 01:  Allyson Felix runs in the first round of the Women's 400 Meters during the 2016 U.S. Olympic Track & Field Team Trials at Hayward Field on July 1, 2016 in Eugene, Oregon.  (Photo by Andy Lyons/Getty Images)